Placement: Freely hanging outside of the calendar, between the months of Mulk (17th) and Ala (18th) “We have ordained that these, amid all nights and days, shall be the manifestations of the letter Há, and thus they have not been bounded by the limits of the year and its months.”-Baha’u’llah, Kitab-i-Aqdas, para. 16.

Element: none

Design: There are 4 intercalary days in 173 BE, and, thus, 4 triangles of dichroic glass fused together represent these days. Mirrored glass was used to reflect the qualities of the 19 panels. One crystal lies within the center of the mobile.